JSX

JSX stands for "JavaScript XML" which in short means that you can use XML in JavaScript which is syntactic sugar for instead of writing out many function calls to create elements, you can just write the elements as if you were writing HTML or XML.

JSX is a concept introduced by React and is used heavily in React applications to build out components.

It is worth noting that the use of JSX is optional and you can still create elements by calling the appropriate functions.